var arr4 = ["houdunren", 22, true];
// 数组不限定位置的类型
arr4[0] = false;
console.log(arr4);
var tuple = ["houdunren", 22, true];
// 元组限定位置的类型
// tuple[0] = false;
tuple[0] = "后盾人";
console.log(tuple);
